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typedef struct fis_reg_h2d
{
    // DWORD 0
    uint8_t fis_type;   // FIS_TYPE_REG_H2D
 
    uint8_t pmport : 4; // Port multiplier
    uint8_t reserved0 : 3;
    uint8_t c : 1;      // 1: Command, 0: Control
 
    uint8_t command;    // Command register
    uint8_t featurel;   // Feature register, 7:0
 
    // DWORD 1
    uint8_t lba0;       // LBA low register, 7:0
    uint8_t lba1;       // LBA mid register, 15:8
    uint8_t lba2;       // LBA high register, 23:16
    uint8_t device;      // Device register
 
    // DWORD 2
    uint8_t lba3;       // LBA register, 31:24
    uint8_t lba4;       // LBA register, 39:32
    uint8_t lba5;       // LBA register, 47:40
    uint8_t featureh;   // Feature register, 15:8
 
    // DWORD 3
    uint8_t countl;     // Count register, 7:0
    uint8_t counth;     // Count register, 15:8
    uint8_t icc;        // Isochronous command completion
    uint8_t control;    // Control register
 
    // DWORD 4
    uint8_t  reserved1[4];
} __attribute__ ((packed)) fis_reg_h2d_t;